Replace
use Math::BigRat; # Useless
use bignum; # Uses M::BigInt and M::BitFloat
with
use bignum upgrade => "Math::BigRat";
or
use bigrat;
I don't think they're equivalent -- the former initially creates M::BigInt objects and switches to M::BigRat when necessary, but I think the latter uses M::BitRat objects from the start -- but they have the same result here.
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